gcc/alias.h

   1 /* Exported functions from alias.c
   2    Copyright (C) 2004, 2007, 2008, 2009, 2010, 2012
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_ALIAS_H
  22 #define GCC_ALIAS_H
  23
  24 #include "coretypes.h"
  25
  26 /* The type of an alias set.  Code currently assumes that variables of
  27    this type can take the values 0 (the alias set which aliases
  28    everything) and -1 (sometimes indicating that the alias set is
  29    unknown, sometimes indicating a memory barrier) and -2 (indicating
  30    that the alias set should be set to a unique value but has not been
  31    set yet).  */
  32 typedef int alias_set_type;
  33
  34 extern alias_set_type new_alias_set (void);
  35 extern alias_set_type get_alias_set (tree);
  36 extern alias_set_type get_deref_alias_set (tree);
  37 extern alias_set_type get_varargs_alias_set (void);
  38 extern alias_set_type get_frame_alias_set (void);
  39 extern bool component_uses_parent_alias_set (const_tree);
  40 extern bool alias_set_subset_of (alias_set_type, alias_set_type);
  41 extern void record_alias_subset (alias_set_type, alias_set_type);
  42 extern void record_component_aliases (tree);
  43 extern int alias_sets_conflict_p (alias_set_type, alias_set_type);
  44 extern int alias_sets_must_conflict_p (alias_set_type, alias_set_type);
  45 extern int objects_must_conflict_p (tree, tree);
  46 extern int nonoverlapping_memrefs_p (const_rtx, const_rtx, bool);
  47
  48 /* This alias set can be used to force a memory to conflict with all
  49    other memories, creating a barrier across which no memory reference
  50    can move.  Note that there are other legacy ways to create such
  51    memory barriers, including an address of SCRATCH.  */
  52 #define ALIAS_SET_MEMORY_BARRIER        ((alias_set_type) -1)
  53
  54 #endif /* GCC_ALIAS_H */